Yazar "Ozden N." seçeneğine göre listele

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    Creating potential erosion risk map of the Karaburun Peninsula by Geographical Information System and remote sensing technique
    (2011) Kurucu Y.; Altinbas U.; Uysal H.; Bolca M.; Esetlili M.T.; Ozen F.; Yonter G.; Ozden N.; Yolcu G.; Karakurt H.; Altun N.
    With this study, it is aimed to draw a potential erosion risk map needed to be used for planning the precautions against erosion, which is one of the biggest problems of our country, by using advanced techniques. An area of 1126 km 2 including the Cesme Karaburun Peninsula, which is located on the west coast of Turkey, has been selected as study area. RUSLE soil loss factors have been used in the study. Each factor used for detecting the soil loss has been determined geographically from different sources and recorded as layer in database according to Geographic Information System. In the study, for determining the C factor a 15-m spatial resolution ASTER image, for determining 'L' and 'S' factors numerical counter lines, for determining 'R' factor weather observation results, and for determining 'K' factor, soil order maps have been used. Afterwards, layers are united by using spatial intersection and new polygons containing all attributes have been created. After the database was created, the Rusle model has been applied and as a result soil loss has been determined for each polygon. At the end of the study, it has been determined that the soil loss in the Cesme Karaburun Peninsula, selected as study area, amounts to 1 279 548 t/ha/year.
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    Functional dyspepsia: Relationship between clinical subgroups and Helicobacter pylori status and Western Turkey
    (Associacao Brasileira de Divulgacao Cientifica, 2003) Saruc M.; Ozden N.; Turkel N.; Ayhan S.; Demir M.A.; Tuzcuoglu I.; Akarca U.S.; Yuceyar H.
    The etiology of functional dyspepsia is not known. The objective of the present study was to determine the characteristics of functional dyspepsia in Western Turkey. We divided 900 patients with functional dyspepsia into three subgroups according to symptoms: ulcer-like (UL), 321 (35.6%), motility disorder-like (ML), 281 (31.2%), and the combination (C) of these symptoms, 298 (33.1%). All patients were submitted to endoscopic evaluation, with two biopsies taken from the cardia and corpus, and four from the antrum of the stomach. All biopsy samples were studied for Helicobacter pylori (Hp) density, chronic inflammation, activity, intestinal metaplasia, atrophy, and the presence of lymphoid aggregates by histological examination. One antral biopsy was used for the rapid urease test. Tissue cagA status was determined by PCR from an antral biopsy specimen by a random sampling method. We also determined the serum levels of tumor necrosis factor-a (TNF-?) and gastrin by the same method. Data were analyzed statistically by the Kolmogorov-Smirnov test and by analysis of variance. Hp and cagA positivity was significantly higher in the UL subgroup than in the others. The patients in the ML subgroup had the lowest Hp and cagA positivity and Hp density. The ML subgroup also showed the lowest level of Hp-induced inflammation among all subgroups. The serum levels of TNF-? and gastrin did not reveal any difference between groups. Our findings show a poor association of Hp with the ML subgroup of functional dyspepsia, but a stronger association with the UL and C subgroups.
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    A gis-based model for rating natural protection areas according to natural protection priorities
    (2007) Bahar T.; Kurucu Y.; Bolca M.; Altinbas U.; Esetlili T.; Gulgun B.; Ozen F.; Gencer G.; Guney A.; Hepcan S.; Ozden N.
    There has been a major urban shift of population in Turkey over the last century. Most people lived in rural areas until 1960, but now more than half live in urban areas. This trend has continued over the last 20 years, as families moved further away from city centres to find houses in the country, and this has caused land use to change rapidly. In decision-making studies to protect nature areas, rating and assessment of ecological data by scientific verification is difficult due to the huge volumeand diversity of data. Therefore, the search for the most suitable and applicable method to achieve physical planning based on ecological understanding has been sought. The necessity for numerous parameters to be taken into account has stimulated the use of geographic information systems (GIS). This study assesses the usefulness of a GIS-based model in the protected area of Kaynaklar County, to the south of the city of Izmir. Existing cultural and natural land-use types, as well as soil, hydrologic, geologic and geomorphologic data layers (future classes) were gathered from field observation and using Landsat and IKONOS satellite images, and transferred to a database according to GIS rules. Index values were determined by taking impact on attributes of natural protection as a priority and these were attached to each feature class. Layers of data were merged by spatial intersection methods and new polygons were created for both cultural and natural features. A three-grade final map of the study area was generated using total index values of each new polygon. © 2007 Taylor and Francis Group, LLC.